try again on syntax errors
diff --git a/.appveyor.yml b/.appveyor.yml
index 89c3af5..82e042e 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -9,10 +9,11 @@
   - debug
 
 environment:
-  - OPTIONS: -Duse_context=ON
-  - OPTIONS: -Duse_context=OFF
-  - OPTIONS: -Dno_floats=ON
-  - OPTIONS: -Dalign_reads=ON
+  matrix:
+    - OPTIONS: -Duse_context=ON
+    - OPTIONS: -Duse_context=OFF
+    - OPTIONS: -Dno_floats=ON
+    - OPTIONS: -Dalign_reads=ON
 
 before_build:
   - cmake -G "Visual Studio 16 2019" -Dfatal_warnings=OFF $(OPTIONS)